You can certainly leave the classroom as soon as your homework__________.
A．has done
B．has been done
C．will be done
D．will have been done
B?
在時(shí)間狀語從句中可以用現(xiàn)在完成時(shí)表示將來，強(qiáng)調(diào)從句的動(dòng)作發(fā)生在主句謂語所表示動(dòng)作之前。?
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